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B747 > Fuel > Flashcards

Fuel Flashcards

1
Q

How many fuel tanks does the aircraft have and what are their approximate capacities?

A

A Center wing tank
Main Tanks 1, 2, 3 & 4
Reserve tanks 2 & 3
Two surge tanks

FCOM 2 12.20.1

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2
Q

What commands fuel valves to open or close and fuel pumps to turn on and off according to fuel management logic?

A

Fuel System Management Cards FSMC’s

FCOM 2 12.20.13

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3
Q

Which crossed valves are affected by flap extension on the ground?

A

Crossfeed valves 2 & 3 close when flaps extend to the T/O position on the ground.

FCOM 2 12.20.13

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4
Q

Which fuel pumps are system logic pumps? in other words, which fuel pumps are commanded to turn on and off by system logic during normal operations?

A

FUEL OVRD 2 & 3 FWD/AFT

FCOM 2 12.20.3

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5
Q

Trace the flow of fuel to the engines when there are 7700 kgs or more fuel in the Center Wing Tank from blockout.

A

The CWT override/jettison pumps feed engines 1 & 4
Main pumps 2 & 3 feed tank-to-engine

FCOM 2 12.20.13

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6
Q

Trace the flow of fuel to the engines when there is less than 7700 kgs of fuel in the Center Wing Tank from blockout.

A

Override/jettison pump 2 feeds engine 1
Override/jettison pump 3 feeds engine 4
Main pumps 2 & 3 feed tank-to-engine

FCOM 2 12.20.13

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7
Q

When do the FSMC’s open the reserve transfer valves?

A

When the main tank 2 or 3 quantity drops to approx 18,200 kgs.

FCOM 2 12.20.12

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8
Q

Under what conditions would fuel automatically transfer from Main Tanks 1 and 4 to their adjacent tanks 2 and 3?

A

When main tank quantity drops to 3,200 kgs

FCOM 2 12.20.12

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9
Q

Can fuel be manually transferred from any tank to another tank?

A

Fuel may be manually transferred from tanks 1 and 4 to 2 & 3 respectively with the overhead panel switch.

FCOM 2 12.20.12

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10
Q

What occurs when Fuel Jettison Switch is selected to either A or B?

A

It arms the jettison system and displays fuel to remain on EICAS

FCOM 2 12.10.4

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11
Q

Describe how the fuel quantity indication changes upon termination of fuel jettison.

A

Fuel quantity will change back to white and flash for 5 seconds.

FCOM 2 12.10.11

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12
Q

What occurs when you push either fuel jettison nozzle valve to ON during the QRH fuel jettison procedure?

A

It activates the override/jettison pumps in tanks containing fuel if the pump switches are on.

FCOM 2 12.10.4

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13
Q

What is the source of fuel for the APU?

A

Tank 2
With AC power available aft boost pumps 2 & 3 supply the fuel
If AC power not avbl, tank 2 DC pump supplies the fuel

FCOM 2 12.20.12

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14
Q

In general, how are fuel imbalance situations handled?

A

by opening or closing crossed valves and fuel pump switches.

FCOM 2 12.20.3

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15
Q

What is the impact on the aircraft of excessive fuel imbalance?

A

It adversely affects CG, drag and fuel economy

FCOM 2 12.20.3

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16
Q

When is an engine on suction feed, and how are suction feed situations corrected?

A

An engine draws fuel by suction feed whenever main tank fuel pump pressure is low.

FCOM 2 12.20.3

17
Q

Does the suction feed line go through the main tank fuel pumps?

A

The suction feed line bypasses the fuel pumps.

FCOM 2 12.20.3

18
Q

A single Main Tank Fuel Pump can provide sufficient fuel to how many engines?

A

1 ENG at T/O; or

2 ENG’s at CRZ

19
Q

A single Main Tank 2 or 3 Override/Jettison pump can provide sufficient fuel to how many engines?

A

2 engines at T/O or CRZ

FCOM 2 12.20.2

20
Q

Can the Main Tank 2 or 3 Override/Jettison pump operate when the related Main Tank is below 3200 kgs (standpipe level)?

A

No, a pump cannot operate below its standpipe level.

21
Q

Fuel tank temperature is measured in which tank?

A

Tank 1

Amber below -37*C
Not avail during jettison - replaced by fuel to remain display.

FCOM 2 12.20.1

22
Q

When does the fuel temperature display on Primary EICAS display in Amber?

A

below -37*C

FCOM 2 12.20.1

23
Q

How is the Center Wing Tank fuel scavenged?

A

By 4 jet pumps (2 pumping into each main tank)

FCOM 2 12.20.2

24
Q

What three different conditions will generate a fuel imbalance message on the EICAS?

A

Longitudinal fuel imbalance of 2,720kg between inboard mains and outboard mains + reserve tanks.

FCOM 2 12.30.1

25
Q

When does the fuel imbalance message no longer display on the EICAS?

A

When imbalance <450kg

FCOM 2 12.30.1

26
Q

When does a Crossfeed Valve ON with the bar visible indication mean for Crossfeed Valve switches 2 and 3?

A

It means the crossfeed is on when commanded by system logic

FCOM 2 12.10.1

27
Q

What does a Crossfeed Valve ON with the bar visible indication mean for Crossfeed Valve Switches 1 and 4?

A

The crossfeed is ON

FCOM 2 12.10.1

28
Q

When are Override/Jettison Pumps 2 and 3 displayed in Cyan on the Fuel System Synoptic?

A

Armed for system logic operation

FCOM 2 12.10.10

B747 (7 decks)

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